Java Socket UDP Program


import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class UDPClient
{
public static void main(String[] args) throws Exception
{
DatagramSocket datagramSocket = new DatagramSocket();

String content = "hello world!";

byte[] buffer = content.getBytes();

InetAddress address = InetAddress.getByName("localhost");

DatagramPacket packet = new DatagramPacket(buffer,buffer.length,address,5678);

datagramSocket.send(packet);

byte[] b = new byte[100];

DatagramPacket packet2 = new DatagramPacket(b,100);

datagramSocket.receive(packet2);

byte[] b2 = packet2.getData();

int l = packet2.getLength();

String str = new String(b2,0,l);

System.out.println("length of string : " + str);

datagramSocket.close();
}
}



import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class UDPServer
{

public static void main(String[] args)throws Exception
{
DatagramSocket datagramSocket = new DatagramSocket(5678);

byte[] buffer = new byte[100];

DatagramPacket packet = new DatagramPacket(buffer,100);

datagramSocket.receive(packet);

byte[] data = packet.getData();

int i = packet.getLength();

String content = new String(data,0,i);

System.out.println("content from client : " + content);

int length = content.length();

String strLength = String.valueOf(length);

byte[] b = strLength.getBytes();

InetAddress address = packet.getAddress();

int port = packet.getPort();

DatagramPacket packet2 = new DatagramPacket(b,b.length,address,port);

System.out.println("length: " + new String(b,0,b.length));

datagramSocket.send(packet2);

datagramSocket.close();


}

}
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